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some of what you ask depends on where you live, or work,

It may seem convenient to have everything on one cart, i would consider your options, though. If your cart has wheels that roll easy , might not be the best if it could get away from you and tip over. Depends on how big of tanks you are using. the home and hobby small ones might be fine. the large commercial or industrial tanks get rather heavy though, and hypothetically speaking if the cart tipped over you could have a barrage of torpedoes on the loose if the regs got damaged. If your working with a flat cement floor with casters on your cart you would probly be ok. I know i have rough terrain type wheels on my one machine cart, and it can leave the cement floor and go outside on gravel or less than level situations. lots of variables to consider. How big of a "footprint" does your cart have? Can you get it through a man door if it was necessary? depends on where you are working. Hope these might help you ponder the best setup for you, post some pictures when you get it done!

It's about 30 inches wide total. 6 inch rubber tires on the rear and 4" lockable castors on the front. I've got a Miller 211 MVP, a Hobart Stickmate LX235 and a Cutmaster 42. Tig will likely be Miller 185.

I took a heavy duty wheeled computer rack and am modifying it with a much heavier plate steel base and larger wheels. Mainly I'm only keeping the tower portion of the rack as it has moveable shelving supports already built in. I've had all this equipment (not the tanks) on the cart before and it was stable then so with the extra weight I'm putting on the bottom it should be rock solid.

I'm home handy man, metal art, maybe fix a few things for friends type of welder. The cart will never be off my concrete garage floor. I'm only doing multi-voltage mchines so I can get portability in the mix.

The post of why would I want to have the O/A tanks when I have a plasma cutter is good, didn't think of that. I guess my main thoughts are putting everything in as tight a wad as possible to save garage space.

I hear ya. I'm all about saving floor space, reducing my footprint .... but .... I think you should try to figure out how to make many small racks that all fit together into the same area of your garage. I think that would be better than one big rack. There's tons of times when you can't bring the work to the machine so you have to bring the machine to the work. I think you should ask yourself how many machines and bottles you want to be tugging around at once when that happens.

Photos

There's enough room for at least five tanks in the back.

The cart started life as a mobile computer stand. I've used it that way for several months and it worked great execept it had no place for tanks. I just followed the basic layout and kept the tower part because it has slots for moveable shelving. It's 26"w X 50"l. 3/16" plate shelves and all the tubing is 1/8" wall 1" square and 1x3 rectangle. It ain't falling over. it will hold all my machines (Miller 211, Hobart 235XL and Cutmaster 40 and still room for a Diversion 180 when it's time. I plan to add some cable wraps and on the back where it's caged in on the sides I've got plans for some slim tool boxes for rods, etc. Also going to mount some outlet boxes so everthing can stay plugged in all the time.